【单选题】At times ,worrying is a normal, ________response to a difficult event or situation—a loved one being injured in an accident , for example.
【单选题】At times, worrying is a normal _____ to a difficult event or situation-a loved one being _____ in an accident, for example. [ ]
【单选题】面对个别游客恶意攻击和诬蔑我国的言论,导游人员应该( )
【单选题】面对个别游客恶意攻击和诬蔑我国的言论,导游人员应该()
【单选题】It is the greatest happiness on earth______. [ ]
A.
to love and to be loved
B.
to love and being loved
D.
loving and to be loved